How To - Proper Interfacing In Nim

[ivanitto]

Does Nim support C-language feature to declare a reference to an object without 
including the external header file where the object is defined?

* * *

For example, what would be Nim analogue for the following C code: 
    
    
    typedef   struct BoxOfStuff *   pBox;
    
    /* no need to include file where contents of BoxOfStuff is
     * defined since here we don't care */
    
    struct Warehouse {
        pBox shelf[];  /* here we want compiler to ensure type of items is pBox 
*/
    }